/* One centered loading shell, including the first module download. The art is
   a small transparent WebP, never another WebGPU scene or a full roster atlas. */
.loading {
  padding: max(20px, env(safe-area-inset-top)) max(20px, env(safe-area-inset-right))
    max(20px, env(safe-area-inset-bottom)) max(20px, env(safe-area-inset-left));
  overflow-y: auto;
  /* Sized by the window as measured (js/viewport.js) and laid out by its own size, a container query,
     not by dvh or the viewport's media queries: an iPhone's Home Screen app can lay the page out at its
     upright size for a moment after a turn, and the art sat off the screen. */
  inset: 0 auto auto 0; width: var(--app-w, 100vw); height: var(--app-h, 100dvh);
  container: loading / size;
}
.loading-box { width: min(440px, 100%); display: grid; justify-items: center; gap: 20px; margin: auto; }
.loading-art { width: min(340px, 42vh); width: min(340px, 42dvh); width: min(340px, 42cqh); aspect-ratio: 1; pointer-events: none; }
.loading-art img { display: block; width: 100%; height: 100%; object-fit: contain; }
.loading-info { width: 100%; min-width: 0; }
.loading-heading { font-size: clamp(28px, 3.4vw, 44px); line-height: 1.15; text-wrap: balance; }
.loading-en { font-size: 12px; letter-spacing: .32em; margin: 10px 0 24px; }
.loading-info [data-loading-note] { min-height: 1.5em; margin: 0; font-size: 15px; }
.loading-info .loading-meter { margin-top: 14px; gap: 16px; }
.loading-meter progress { border-radius: 6px; overflow: hidden; }
.loading-meter span { font-variant-numeric: tabular-nums; }
.loading-info [data-loading-retry] { margin-top: 18px; }
/* Landscape phones use the available width; status and retry stay beside art. (By the screen's own
   size, its padding taken off: 540 by 600 of the window. The media query only where container queries
   aren't, which would otherwise go on applying the window's stale size.) */
@container loading (min-width: 500px) and (max-height: 560px) {
  .loading-box { width: min(800px, 100%); grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 28px; align-items: center; }
  .loading-art { width: min(100%, 290px, 72cqh); }
  .loading-heading { font-size: clamp(26px, 3.4cqw, 38px); }
  .loading-en { font-size: 11px; margin-bottom: 20px; }
}
@supports not (container-type: size) {
  @media (min-width: 540px) and (max-height: 600px) {
    .loading-box { width: min(800px, 100%); grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 28px; align-items: center; }
    .loading-art { width: min(100%, 290px, 72vh); width: min(100%, 290px, 72dvh); }
    .loading-heading { font-size: clamp(26px, 3.4vw, 38px); }
    .loading-en { font-size: 11px; margin-bottom: 20px; }
  }
}

/* Failure evidence takes priority over decoration, with one native page scroller.
   No fixed-height inner panel: expanded local details stay reachable on phones. */
.loading[data-loading-error] .loading-art { display: none; }
.loading[data-loading-error] .loading-box { width: min(920px, 100%); grid-template-columns: 1fr; gap: 8px; }
.loading[data-loading-error] .loading-heading { font-size: 24px; }
.loading[data-loading-error] .loading-en { display: none; }
.loading[data-loading-error] .loading-info > [data-loading-retry] { margin-top: 10px; }
.loading-diagnostics { margin-top: 10px; text-align: left; min-width: 0; }
.loading-diagnostics pre { white-space: pre-wrap; overflow-wrap: anywhere; margin: 0 0 8px; font: 12px/1.4 ui-monospace, monospace; letter-spacing: 0; }
.loading-diagnostics details { margin: 6px 0; }
.loading-diagnostics summary { cursor: pointer; min-height: 44px; display: flex; align-items: center; }
.loading-diagnostics button, .loading[data-loading-error] [data-loading-retry] { min-height: 44px; font-size: 14px; }
.loading-diagnostics [role="status"] { font-size: 12px; margin-left: 8px; }
@media (max-height: 460px) {
  .loading[data-loading-error] { padding-top: max(8px, env(safe-area-inset-top)); padding-bottom: max(8px, env(safe-area-inset-bottom)); }
}
@container loading (max-height: 444px) {
  .loading[data-loading-error] .loading-heading { font-size: 20px; }
  .loading[data-loading-error] .loading-meter { margin-top: 6px; }
  .loading-diagnostic-summary { font-size: 12px; }
}